ELECTRICAL SYSTEM
STW34, STW37, STW40, WSM
9-S40
Engine Oil Pressure Switch
1. Disconnect the lead (2) from the engine oil pressure switch after
turning the main switch OFF.
2. Turn the main switch ON and connect a jumper lead from the
lead to the chassis.
3. If the engine oil pressure indicator lamp does not light, the panel
circuit or the wiring harness is faulty.
9Y1211109ELS0072US0
(27) Gauges
Fuel Level Sensor
1) Sensor Continuity
1. Remove the fuel level sensor from the fuel tank.
2. Measure the resistance with an ohmmeter across the sensor
terminal and its body.
3. If the reference value are not indicated, the sensor is faulty.
9Y1211109ELS0073US0
Coolant Temperature Sensor
1) Lead Terminal Voltage
1. Disconnect the lead from the coolant temperature sensor after
turning the main switch off.
2. Turn the main switch on and measure the voltage with a
voltmeter across the lead terminal and the chassis.
If the voltage differs from the battery voltage, the wiring harness,
fuse or coolant temperature gauge is faulty.
2) Sensor Continuity
1. Measure the resistances with an ohmmeter across the sensor
terminal and the chassis.
2. If the reference value is not indicated, the sensor is faulty.
9Y1211109ELS0074US0
(1) Engine Oil Pressure Switch
(2) Switch Lead
(a) From Oil Pressure Lamp
Resistance
(Sensor terminal
– its body)
Reference value
Float at
upper-most
position
1 to 5 Ω
Float at
lower-most
position
103 to 117 Ω
Voltage Lead terminal – Chassis Approx. battery voltage
Resistance
(Sensor terminal –
Chassis)
Reference
value
Approx. 16.1 Ω at 120 °C (248 °F)
Approx. 27.4 Ω at 100 °C (212 °F)
Approx. 51.9 Ω at 80 °C (176 °F)
Approx. 153.9 Ω at 50 °C (122 °F)
(1) Coolant Temperature Sensor (a) From Temperature Gauge
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